CVE-2026-31657

In the Linux kernel, the following vulnerability has been resolved: batman-adv: hold claim backbone gateways by reference batadv_bla_add_claim() can replace claim->backbone_gw and drop the old gateway's last reference while readers still follow the pointer. The netlink claim dump path dereferences claim->backbone_gw->orig and takes claim->backbone_gw->crc_lock without pinning the underlying backbone gateway. batadv_bla_check_claim() still has the same naked pointer access pattern. Reuse batadv_bla_claim_get_backbone_gw() in both readers so they operate on a stable gateway reference until the read-side work is complete. This keeps the dump and claim-check paths aligned with the lifetime rules introduced for the other BLA claim readers.

The following products are affected by CVE-2026-31657 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-31657.

URL	Resource
https://git.kernel.org/stable/c/1f2dc36c297d27733f1b380ea644cf15a361bd7b
https://git.kernel.org/stable/c/2f55b58b5a0bbed192d60c444a45a49cdf1b545f
https://git.kernel.org/stable/c/4dee4c0688443aaf5bbec74aa203c851d1d53c35
https://git.kernel.org/stable/c/7962b522222628596ca9ecc8722efc95367aadbd
https://git.kernel.org/stable/c/82d8701b2c930d0e96b0dbc9115a218d791cb0d2
https://git.kernel.org/stable/c/f4858832ddef2f39f21e30b7226bbcd3c4b2bc96